Contribution to the Knowledge of the Electrochemistry of Uranium in Molten LiCl‐KCl Eutectic (): IV. The potential of the couple U(III)/U(0)

Abstract

We have measured the standard potentials of the system U(III)/U(0), in the molten LiCl‐KCl eutectic, within the temperature range from 400 to 550°C. The cell used has been the following: The work has been carried out in glove‐boxes, under inert atmosphere, and special care has been taken in preventing even the slightest oxidation of U(III). A comparison has been made with previous results, obtained by different Authors.

In-situ observation of a dendrite growth in an aqueous condition and a uranium deposition into a liquid cadmium cathode in an electrowinning system

“…The U diffusion coefficient calculated by using this equation was about 1 Â 10 À5 cm 2 /s at 773 K, which agrees well with the results reported previously, that is, 0.25-5 Â 10 À5 cm 2 /s [12,13]. 200 mA/cm 2 .…”

Thermodynamic Assessment of CrCl2 with NaCl–KCl–MgCl2–UCl3–UCl4 for Molten Chloride Reactor Corrosion Modeling

“…The calculated dilute activity coefficient values of liquid UCl 4 at lower temperatures are in very good agreement with those measured but diverge to a small extent at the higher temperature (Figure 10). Overall, the values are in the range of experimental uncertainty for open circuit potentiometric measurements of uranium chlorides, 57 and as the calculated γ U 4+ values were determined relative to those previously obtained for γ U 3+ , 23 well represents the measured liquidus values of Desyatnik et al 8 The eutectic temperature is reported by Desyatnik et al 8 8 who report an identical eutectic temperature of 813.2 K; however, their reported liquidus temperatures and eutectic compositions differ significantly. The values of Desyatnik et al 8 were considered more reliable as they are from differential thermal analysis (DTA) as opposed to the surface temperature technique of Sterlin and Artamonov.…”

“…The calculated dilute activity coefficient values of liquid UCl 4 at lower temperatures are in very good agreement with those measured but diverge to a small extent at the higher temperature (Figure ). Overall, the values are in the range of experimental uncertainty for open circuit potentiometric measurements of uranium chlorides, and as the calculated γ U 4+ values were determined relative to those previously obtained for γ U 3+ , they are expected to have a larger uncertainty due to the compounding of errors from the experimentally determined γ U 3+ values. E * prefix= E normalA normalg + ° − E normalU 4 + prefix→ 3 + ° + normalR T normalF ln ( γ A g + γ U 3 + γ U 4 + ) E normalU 4 + prefix→ 3 + normalo = 3 E normalU 3 + normalo − 4 E normalU 4 + normalo E cell = ...…”

Thermodynamic properties of uranium in Ga–In based alloys

“…Uranium metal does not noticeably react with alkali chlorid e based melts containing dissolved uranium(III) chloride [16][17][18][19] and therefore can be safely employe d as the refere nce electrode. Low meltin g ternary LiCl-KCl-CsCl eutectic (57.5 mol.% LiCl and 16.5 mol.% KCl, m.p.…”